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Yola sets a 301 re-direct so that your canonical or primary domain is the non-www URL. You could contact Yola through their Contact Customer Support form and ask if they could do this for you. Previously I think that we could change this ourselves but I can't find a current user reference to the process.

If you have set the canonical in Google webmasters then that is the way search results will be displayed of your site. Other than that there's no SEO advantage/disadvantage in having the canonical as the non-www version, there's no duplicate penalty overall. If you change your canonical though the robots may have to re-index your site and you may see an effective drop in ranking until the process is completed(?).

Other than a personal preference there doesn't appear to be any advantage in the www canonical and it does reduce the transcription for verbal nomination of your site. Most commentators would say that it's a remnant from a time gone bye. ie university servers in the 80's when they were initially connecting to the internet and they labelled and reserved these servers as "www.university-name.xxx" when they called the internet the "world wide web" like no one does now (except a couple of previous US Presidents). :)